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首页> 外文会议>Proceeding of An International Conference the Importance of understanding the fundamentals of the fatigue Process in Counteracting Its Effects in Engineering Components and Structures,and to Reflect on the Contributions of K.J.Miller Sheffield/United >The relevance of crack closure and crack initiation evaluation techniques to small fatigue crack behaviour
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The relevance of crack closure and crack initiation evaluation techniques to small fatigue crack behaviour

机译：裂纹闭合和裂纹萌生评估技术与小疲劳裂纹行为的相关性

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Interest in small fatigue cracks has waned somewhat over the last few years,at least partly because of a perceived lack of relevance to life prediction in general structural engineering.however,cross-overs in fatigue performance of aluminium weldments,as life increases from around 10~5 cycles to 10~7 cycles,indicate that crack initiation and early crack growth are important to the overall life.Significant work therefore remains to be done in understanding small crack behaviour,particularly under multi-mode variable amplitude loading.Progress is hindered by certain experimental difficulties related to monitoring growth,measuring and interpreting closure phenomena,and the effect of certain crack generation techniques on observed phenomena.The paper briefly reviews soem of these issues.
机译：在过去的几年中，人们对小型疲劳裂纹的兴趣有所减弱，至少部分是由于人们认为与一般结构工程中的寿命预测缺乏相关性。然而，随着寿命的增加，铝焊件的疲劳性能出现了交叉变化，大约从10 〜5个周期至10〜7个周期，表明裂纹萌生和早期裂纹扩展对整个寿命至关重要。因此，在理解小裂纹行为方面，尤其是在多模式可变振幅载荷下，仍有大量工作要做。某些与监测生长，测量和解释闭合现象有关的实验困难，以及某些裂纹产生技术对观察到的现象的影响。本文简要回顾了这些问题的解决方法。

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